Studies were carried out to produce toxins fromColletotrichum falcatum which was also bioassayed by screening themin vitro andin vivo on ten sugarcane varieties, in order to determine their resistance and susceptibility. The toxin was produced from liquid culture inoculated with the fungus which was later sieved and used in the crude form. Further partial purifications and characterisation was carried out using series of standard tests and methods. During the bioassay and screening tests, it was observed that, of all the ten sugarcane varieties, CP70/1133 and LSI-803 were fairly resistant but CP70/1133 showed more resistant attributes than LSI-083. The movement of the toxin was towards the apical region of the plant parts. This is an indication that the pathogen action moves upward as the plant grows.
Key WordsColletotrichum falcatum sugarcane resistance susceptibility toxin bioassay screening
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